MauriceBrocco wrote: ↑Sat May 20, 2023 9:13 pm
graeme_f_k wrote: ↑Fri May 19, 2023 11:17 am
There are other elements to this - but generally, it's fair to say that the more steps a mechanic takes away from the OEM spec, the greater the likelihood of problems in function or durability. So, 11s chainrings on the 12s system - we do it on the teams sometimes in very specific circumstances (TTs) and swallow the known problems of accelerated chainring tooth wear and the knock-ons for chain and cassette wear. Now take athird party chainring & you add a further layer of possible problem. Were you to add a third party chain, that would be another layer - abuse the capacity of the derailleur and it all gets even more unpredictable.
Thx, Graeme!
I sourced a set of Record/Super Record 12sp chainrings 52/36 teeth. Am I correct in assuming that these will fit my H11 crankset, because the spider is basically the same shape as on the Record 12sp crank?
I did closely investigate the issue I have with my 11sp rings. I got a used set of original Record 11sp rings in 50/34 and the tooth profile and ramping does look slightly different on the aftermarket chainrings. So I guess that this, combined with the fact that I'm running 12sp on 11sp rings is enough to cause chain skipping under high torque. Again, only on the small ring.
Sorry for the late reply ...
For reference, we have fitted 12s rings to 11s cranks without issues & that has ben the recommendation on Power"Max cranks, for instance, when used on 12s systems.
Differences in effective chainring spacings have been managed on the chainrings themselves for some time - it's usually a question of where in the guage of the material the teeth are milled and / or a stepping / dishing of the surface of the chainring in one direction or the other to change effective ring spacing.
Differences in chain width are also to some extent managed, in the context of front shifting, by the exact shaping of the back of the outer chainring - not just the ramps and pins but also, the shaping of the surface that the ramps are milled into - it's fairly clearly visible if you compare, say, 11s post 2015, 11s HO and 12s rings.
A Tech-Reps work is never done ...
Head Tech, Campagnolo main UK ASC
Pls contact via velotechcycling"at"aim"dot"com, not PM, for a quicker answer. Thanks!